<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link rel="stylesheet" href="./css/bootstrap.min.css">
    <script src="./js/jquery-1.12.4.min.js"></script>
    <script src="./js/bootstrap.min.js"></script>
</head>

<body>


    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>

    <div class="container">
        <!--dropup是向上-->
        <div class="dropdown">
            <button type="button" class="btn btn-default" data-toggle="dropdown">
                商品
                <span class="caret"></span>
            </button>
            <ul class="dropdown-menu">
                <li><a href="">衣服</a></li>
                <li><a href="">鞋</a></li>
                <li><a href="">电脑</a></li>
                <li><a href="">手机</a></li>
                <li class="divider"></li>
                <li><a href="">水果</a></li>
            </ul>

        </div>


    </div>


</body>

</html>